Electric clipper

ABSTRACT

Disclosed herein is a hair clipper comprising a housing, a blade set including a first or stationary blade, including thereon a bracket defining a groove, and a blade set mounting assembly including a mounting plate fixed to the housing, a tongue removably extending into the groove, a hinge pin connecting the tongue and the mounting plate to afford pivotal movement of the tongue relative to the mounting plate between a first position permitting insertion and withdrawal of the tongue relative to the groove, and a second position preventing such insertion and withdrawal, a leaf spring secured to the mounting plate and including a portion engaging the tongue for selectively and releasably holding the tongue in the first and second positions, and a spring retainer mounted on the mounting plate and including a tip and spaced wings releasably gripping the bracket to releasably retain the blade set on the tongue, and a helical spring bearing, at one end, against the housing and bearing, at the other end, against the portion of the leaf spring to augment the action of the leaf spring.

This is a division of application Ser. No. 572,056 filed Apr. 28, 1975,now U.S. Pat. No. 3,992,778.

BACKGROUND OF THE INVENTION

The invention relates generally to hair clippers and to electricallyoperated hair clippers.

The invention also relates to arrangements for electrically insulatingan electrically operated hair clipper.

The invention also relates to arrangements for reciprocating the movableblade of a hair clipper blade set in response to rotary movement of theoutput shaft of an electric motor.

The invention also relates to spring arrangements for releasably andselectively retaining a blade set holding tongue or pivot arm in anoperating position and in a second position affording connection anddisconnection of the blade set relative to the tongue or pivot arm.

The invention also relates to arrangements for preventing relativemovement between the stationary blade of a blade set and a blade setmounting tongue or pivot arm.

SUMMARY OF THE INVENTION

The invention provides a hair clipper comprising an outer housing ofelectrically insulating material, a motor located in the housing andincluding a field structure, an armature structure including a shaft,and bearing assemblies spaced axially of the armature structure andengaging the armature structure and the field structure for supportingthe armature structure for rotation relative to the field structure,each of the bearing assemblies including a bearing and a bearing sleevefabricated of electrically insulating material and located to isolatethe bearing from one of the armature structure and the field structure,and means connecting the field structure and the outer housing.

In an embodiment of the invention, the field structure includes apermanent magnet and the bearing sleeves are fabricated of resilientmaterial and are located between the bearings and the field structure.

The invention also provides a hair clipper including a housing, a motorlocated in the housing and having a rotatable shaft including a firstportion and an end portion projecting from the first portion ineccentric relation to the rotary axis of the first portion, a drivemember located in co-axial, surrounding relation to the end portion, anannular bearing between and engaging the end portion and the drivemember to afford relative rotation therebetween, and means retaining thedrive member on the end portion in co-axial, surrounding relation to theend portion. Preferably the bearing is a ball bearing.

In an embodiment of the invention, the drive member has an outerdiameter and the means retaining the drive member on the end portion inco-axial, surrounding relation comprises a tapered nose element which ispreferably fabricated of plastic and has a base with diameterapproximately equal to the outer diameter of the drive member, and meanssecuring the nose element on the end portion.

Also in an embodiment of the invention, the hair clipper includes ablade set connected to one of the housing and the field structure andincluding a first blade fixed relative to one of the housing and fieldstructure, a second blade movable relative to the first blade andincluding thereon a driven element formed of electrically insulatingmaterial and engaged by the drive member to cause reciprocating movementof the second blade relative to the first blade in response to rotationof the shaft.

The invention also provides a hair clipper comprising a housing assemblyincluding a recess, a blade set having a stationary blade with meansthereon defining a groove, a blade set mounting assembly including amounting plate fixed to the housing assembly, a tongue removablyextending into the groove, means on the tongue and on the mounting plateaffording pivotal movement of the tongue relative to the mounting platebetween a first position permitting insertion and withdrawal of thetongue relative to the groove and a second position preventing suchinsertion and withdrawal, and spring means secured to the mounting plateand including a portion engaging the tongue for selectively andreleasably holding the tongue in the first and second positions, and aspring in the recess bearing, at one end, against the housing assemblyand bearing, at the other end, against the portion of the spring meansto augment the action of the spring means.

The invention also provides a hair clipper comprising a housingassembly, a blade set having a stationary blade with means thereondefining a groove, a blade set mounting assembly including a mountingplate fixed to the housing assembly, a tongue movably carried by themounting plate and removably extending into the groove, and a springretainer mounted on the mounting plate and including means releasablygriping the means defining the groove to releasably clamp the blade seton the tongue.

In an embodiment of the invention, the means on the stationary bladedefining a groove comprises a mounting bracket having a raised centralportion with a first edge and a pair of spaced edges, and the springretainer includes a lip releasably engaging the first edge of the raisedcentral portion and further includes a pair of spaced wings releasablyclamping the pair of spaced edges of the raised central portion.

The invention also provides a movable blade for a hair clipper bladeset, which movable blade comprises a blade member having a forward edgewith a series of teeth extending therealong, a rearward edge, and anupper surface located between the forward and rearward edges and havingtherein a recess with second and third edges extending in laterallyspaced relation to each other generally perpendicularly to the forwardand rearward edges, a yoke member which includes a main body ofgenerally U-shape including first and second walls extending inlaterally spaced relation to each other and a web connecting the firstand second walls, which also includes first and second flange portionsrespectively extending in laterally outwardly co-planar relation fromthe first and second walls, and which extends in the recess with thefirst and second walls extending adjacent to the second and third edgesand upwardly therefrom and with the flange portions in overlyingengagement with the upper surface of the blade member, a brace memberwhich comprises first and second wall portions extending in laterallyspaced parallel relation to each other, a bridge portion connecting thewall portions, first and second flange portions respectively extendingin laterally outward coplanar relation from the first and second wallportions, and respective tabs extending downwardly from the flangeportions in generally perpendicularly relation thereto, and which islocated with the first and second wall portions in laterally outwardlyoverlying engagement with the first and second walls of the yoke member,with the flange portions of the brace member in overlying engagementwith the flange portions of the yoke member, and with the bridge portionextending forwardly of the walls of the yoke member, and with the tabsin overlying engagement with the rearward edge of the blade member, andmeans fixedly securing together in assembled relation the blade member,the yoke memeber, and the brace member.

In an embodiment of the invention, the movable blade further includes areinforcing member which includes an elongated portion having an upperedge and first and second flange portions extending from the upper edgein laterally spaced relation to each other, and which is located withthe elongated portion in overlying engagement with the tabs of the braceportion, with the flange portions in overlying engagement with theflange portions of the brace member, and with the means fixedly securingthe blade member, the yoke member, and the brace member also fixedlysecuring the reinforcing member in assembled relation to the blademember, the yoke member, and the brace member.

One of the principal features of the invention is the provision of anelectric hair clipper having a permanent magnet motor including anarmature structure mounted for rotation within a field structure bybearing assemblies which provide electrical insulation.

Another of the principal features of the invention is the provision of ahair clipper including a rotably mounted annular drive member which iseccentrically mounted for rotation on a motor output shaft, which isfabricated of metal, and which operably engages a plastic element fixedon a movable blade to effect reciprocation thereof relative to astationary blade in response to output shaft rotation.

Another of the principal features of the invention is the provision in ahair clipper of an auxiliary spring to assist the action of a primaryspring which selectively and releasably retains a blade set pivot arm ortongue in a first position permitting attachment and disattachment of ablade set thereon, and a second position in which the blade set islocated for hair-clipping operation.

Still another of the principal features of the invention is theprovision of a hair clipper including a spring retainer mounted on ablade set pivot arm or tongue for clampingly engaging a bracket on thestationary blade of a blade set so as to releasably prevent relativemovement between the stationary blade and the pivot arm or tongue.

Other features and advantages of the embodiments of the invention willbecome known by reference to the following drawings, generaldescription, and claims.

THE DRAWINGS

FIG. 1 is a side elevational view, partially broken away and in section,of a hair clipper embodying various of the features of the invention.

FIG. 2 is an enlarged front view of the hair clipper shown in FIG. 1with the blade set removed.

FIG. 3 is a top plan view of the blade set incorporated in the hairclipper shown in FIG. 1.

FIG. 4 is a top plan view showing the drive arrangement for the bladeset incorporated in the hair clipper shown in FIG. 1

FIG. 5 is a fragmentary side elevational view, partially broken away andin section, of the drive arrangement for the blade set incorporated inthe hair clipper shown in FIG. 1.

FIG. 6 is a sectional view taken along line 6--6 of FIG. 5.

FIG. 7 is a sectional view taken along line 7--7 of FIG. 5.

FIG. 8 is a cross sectional view taken along line 8--8 of FIG. 9.

FIG. 9 is a side elevational view of a blade member incorporated in theblade set included in the hair clipper shown in FIG. 1.

Before explaining the embodiments of the invention in detail, it is tobe understood that the invention is not limited in its application tothe details of construction and the arrangements of the components setforth in the following description or illustrated in the drawings. Theinvention is capable of other embodiments and of being practiced andcarried out in various ways. Also, it is to be understood that thephraseology and terminology employed herein is for the purpose ofdescription and should not be regarded as limiting.

GENERAL DESCRIPTION

Shown in the drawings is an electical hair clipper 11 which embodiesvarious of the features of the invention and which includes a housing 13which is constructed of electrically insulating material, such asplastic. Any suitable design can be employed and, in the illustratedconstruction, the housing comprises two sections or parts 17 and 19which are connected together by a plurality of screws 21.

Located in the housing 13 is an electrical motor 21 which can be ofvarious designs but which, preferably, is an alternating currentpermanent magnet motor. Thus, the motor 21 includes a field structure 23which includes one or more permanent magnets but which is withoutelectrical connection to a source of power. The field structure 23 issecured to and retained in the housing 13 to provide a housing assembly24 by reason of engagement with a pair of upstanding bosses 25 whichrespectively threadably receive two of the screws 21 and by reason of anadditional screw connections 27 between the field structure 23 and oneof the housing sections 17 and 19.

Rotably mounted within the field structure 23 is an armature structure31 including a shaft 33 having two axially spaced portions 34 and 35, awinding 36 carried by the shaft 33 between the portions 34 and 35, and asplit comutator ring 37 which is also carried by the shaft 33 betweenthe portions 34 and 35 and electrically connected to the winding 36.

Means are provided for rotatably mounting the armature structure 31within the field structure 23 while, at the same time, electricallyisolating and resiliently mounting the armature structure 31 from thefield structure 23. While various arrangements can be employed, in theillustrated construction, such means comprises two axially spacedbearing assemblies 41 which extend between the field structure 23 andthe armature shaft portions 34 and 35 and which respectively include abearing 43 and a bearing sleeve 45.

The bearing sleeves 45 are constructed of electrically insulatingmaterial and, while the bearing sleeves 45 can be located between thebearings 43 and either of the armature shaft 33 and the field structure23, it is preferred to locate the bearing sleeves 45 between thebearings 43 and the field structure 23 and to have the bearings 43operatively engaged with the armature shaft portions 34 and 35.Preferably, the bearing sleeves 45 are of rubber or rubber-like materialto permit compression during assembly, thus accommodating more liberalmanufacturing tolerances.

In addition, the field structure 23 is fabricated to support a pair ofbrush assemblies 51 which are diametrically, oppositely located, whichare operatively engaged with the split comutator ring 37, and which areelectrically connected to a pair of suitable electrical leads 53 whichenter into the housing 13. It is noted that these electrical connectionsare spaced from the field structure 23 and constitute the onlyconnections of the motor 21 to a source of current.

More particularly, the field structure 23 includes two diametricallyopposite bores 55 which respectively receive brush sleeves 57 ofinsulating material, such as plastic. The brush sleeves 57 are retainedin the bores 55 of the field structure 23 by suitable means, such as setscrews 59 and contain carbon brushes 61 and metalic brush holders 63which are electrically connected to the electrical leads 53.

In the illustrated construction, the brush sleeves 57 extend outwardthrough registering apertures 65 in the housing 13 and are closed bycaps or closures 67 which are respectively received in the brush sleeves57 and which additionally serve to urge respective brush springs 69against the brushes 61.

Located at one end of the housing 13 is a blade set 71 which includes afixed blade or shear plate 73 fixed relative to the housing 13 and fieldstructure 23 and a movable blade, plate or comb 75 reciprocable on andrelative to the fixed plate 73. In this last regard, the blade set 71preferably includes suitable means for guiding reciprocation of themovable blade 75 relative to the fixed blade 73. The movable blade 75includes a generally flat blade member or plate 175 which includesforwardly and rearwardly co-planar lower surfaces 177 which bear againstthe fixed blade 73, an upper surface 179, a forward edge 183 with aseries of teeth 185 cooperating with teeth on the forward edge of thefixed blade 73, and a rearward edge or surface 187 which preferablyextends in generally perpendicular relation to the lower and uppersurfaces 177 and 179. Located centrally of the blade member 179 is arecess 189 which extends from the upper surface 179, which can either beblind or extend completely through the blade member 175, and whichincludes two laterally or transversely spaced edges or walls 191extending in generally perpendicular relation to the forward andrearward edges 183 and 185.

The movable blade 75 includes means for engaging the armature shaft 33for reciprocating the movable blade 75 in response to rotation of thearmature shaft 33 while, at the same time, electrically insulating themovable blade 75 from the armature shaft 33.

In this last regard, the movable blade 75 has fixedly extendingtherefrom an element which is driven by the armature shaft 33 and whichis in the form of a yoke member 81 which is preferably constructed ofelectrically insulating material, such as plastic, and which includes amain portion which, in part, is located in the recess 191, and isgenerally of U-shape including first and second laterally spaced arms orwalls 83 which extend upwardly from the edges 191 of the recess,together with a connecting web or wall 197 which extends between thelower edges of the walls 83 and is located in the recess 191. The armsor walls 83 respectively include rearwardly and upwardly extending edgeportions or margins having arcuately laterally outwardly flaringterminal portions 85 extending toward the armature shaft 33.

The yoke member 81 also includes first and second flange portions 201which respectively extend in laterally outward co-planar relation fromthe first and second walls 83 in overlying engagement with the uppersurface 179 of the blade member 175.

The movable blade 75 also includes a brace member 211 which ispreferably constructed of metal, such as spring steel, and whichincludes first and second laterally spaced parallel wall portions 213located in laterally outwardly overlying relation to the walls 83 of theyoke member 81. Preferably, the wall portions 213 of the brace member211 are co-extensive with the walls 83 of the yoke member 81 above theflange portions 201. In addition, the brace member 211 includes a bridgeportion 215 which unites the wall portions 213 and which extendslaterally therebetween from the forward edges of the wall portions 213and above the lower edges of the wall portions 213 and forwardly of theforward edges of the walls 83 of the yoke member 81.

The brace member 211 further includes flange portions 217 whichrespectively extend laterally outwardly and in co-planar relation fromthe lower edges of the wall portions 213 and in overlying engagementwith the flange portions 201 of the yoke member 81. In addition, thebrace member 211 includes laterally spaced tabs 219 which extendrespectively from the rearward edges of the flange portions 217 ingenerally perpendicular relation thereto and in overlying engagementwith the rearward surfaces 187 of the blade member 175.

In addition, the movable blade 75 preferably includes a reinforcingmember 221 which is fabricated of metal, such as spring steel. Thereinforcing member 221 includes an elongated portion 223 which overliesthe spaced tabs 219 of the brace member 211, together with a pair oflaterally spaced flange portions 225 which extend from the upper edge ofthe elongated portion 223 in generally perpendicular relation theretoand in overlying engagement with the flange portions 217 of the bracemember 211.

Means are provided for fixedly securing together the blade member 175,the yoke member 81, the brace member 211, and the reinforcing member221. While various arrangements can be employed, in the illustratedconstruction, such means comprises a pair of rivets 231 which extendthrough the flange portions 225 of the reinforcing member 221, throughthe flange portions 201 of the yoke member 81 and through the body ofthe blade member 175.

Extending between the arms or walls 83 for engagement therebetween is anannular drive shaft member 91 which is driven by the armature shaft 33,which is preferably of metallic construction, such as stainless steel,and which has an outer surface in engagement with and between the arms83. The drive member 91 also includes an inner surface in engagementwith a bearing 93 which, in turn, is engaged on a portion 95 of thearmature shaft extending in eccentric relation to the adjacent armatureshaft portion 34 supported by one of the bearing assemblies 41.Preferably the bearing 93 is a ball bearing.

The annular drive member 91 is retained on the shaft portion 95 by anose element or member 97 which is preferably constructed ofelectrically insulating material, such as plastic, and which isgenerally conical in shape so as to guide entrance of the nose memberbetween the yoke arms 83 and which has a base with a diameterapproximately equal to the outer diameter of the drive member 91 so asto restrain axial outward movement of the drive member 91 intoengagement between the arms 83.

Suitable means are provided for retaining the nose member 97 on the endof the eccentric armature shaft portion 95. While various arrangementscould be employed, in the illustrated construction, such means comprisesa threaded stud on one of the nose member 97 and the eccentric armatureshaft portion 95 and a threaded recess receiving the stud on the otherof the nose member 97 and the shaft portion 95. Specifically, in theillustrated construction, the eccentric shaft portion 95 includes athreaded projection 99 and the nose member 97 includes a threaded recess101 receiving the threaded projection 99.

The connection of the blade set 71 and particularly the fixed blade 73,to the housing 13 and field structure 23 permits releasable attachmentof the blade set 71 on the hair clipper 11. In this regard, the bladeset attachment means comprises a bracket 111 which is fixed on thestationery blade or shear plate 73 and which includes a raised centralportion 113 defining between the bracket 111 and the shear plate 73, agroove or slot 115 adapted to receive a tongue or pivot arm 117 carriedon a mounting plate 119 fixed to one or both of the housing 13 and fieldstructure 23 by suitable means, such as a pair of screws 121. Further inthis last regard, the tongue or pivot arm 117 is carried by the mountingplate 119 about a hinge pin 123 for movement between a first positionaffording insertion and withdrawal of the tongue 117 relative to thegroove or slot 115 and an operating position in which the blade set 71is located for engagment of the rotatable annular drive member 91between the yoke arms 83. As indicated earlier, during movement of thetongue 117 from the first position to the operating position, the flaredterminal portions 85 of the yoke arms 83 and the conical shape of thenose member 97 facilitate insertion of the drive member 91 between theyoke arms 83.

Means are provided for selectively and releasably retaining the pivotarm or tongue 117 in either of the first and operating positions. Whilevarious arrangements are possible, in the illustrated construction, thetongue or pivot arm 117 includes rearwardly of the hinge pin 123, anupwardly extending flange 131 which is engaged by a downwardly convexend portion 133 of a biasing spring 135 which is fixed to the top of araised central portion 137 of the mounting plate 119. In operation,engagement of the curved portion 133 of the spring 135 with the flange131 serves to releasably retain the tongue or pivot arm 117 in either ofthe first or operating positions.

Means are provided on one or both of the field structure 23 and housing13 for augmenting the action of the biasing spring 135. In this regard,in the illustrated construction, the housing 13 is formed to expose thefield structure 23 which, in turn, is provided with a recess 139 whichreceives a helical compression spring 141 which, at its outer end, bearsagainst the top side of the downwardly convex portion 133 of the biasingspring 135 so as to increase the force applied by the biasing spring 135to releasably hold the tongue or pivot arm 117 in either of its twopositions. Employment of the helical spring 141 also serves to partiallyrelieve the loading on the biasing spring 135 and to thereby increasethe life of the biasing spring 135. If desired, as already indicated,the helical spring 141 could be contained in a recess in the housing 13.

The mounting plate 119 also has fixed, on the upper surface of theraised central portion 137, a spring retainer 143 which is adapted tograsp the central portion 113 of the bracket 111 on the stationary blade73 to releasably prevent relative movement between the tongue or pivotarm 117 and the stationary blade 73. In this regard, the spring retainer143 is fixed on the mounting plate by a rivet 145 which also fixes thebiasing spring 135.

In order to releasably grip the stationary blade bracket 111, the springretainer 143 includes an outer lip 151 which is adapted, when the bladeset 71 is received on the tongue 117, to grip the edge of the stationaryblade bracket 111 remote from the hinge pin 123 so as to releasablyclamp or grip the stationary blade bracket 111 against a shoulder 153formed on the tongue 117 adjacent to the hinge pin 123.

In addition, the spring retainer 143 includes two laterally spaced wings161 which are adapted to releasably grip or clamp therebetween the sideedges 163 of the raised central portion 113 of the stationary bladebracket 111 so as to prevent lateral movement of the stationary blade 73relative to the tongue 117 while, at the same time, avoidinginterference with ease of insertion and withdrawal of the tongue 117relative to the groove 115. In this regard, it is noted that withdrawaland insertion of the tongue 117 relative to the groove 115 occurs whenthe tongue or pivot arm 117 is in the first position and that the springretainer 143 releasably grips the raised central portion 113 of thestationary blade bracket 111 incident to movement of the tongue 117 tothe operating position.

Thus, when the tongue 117 is in the operating position, the stationaryblade 73 is firmly but releasably held stationary relative to the fieldstructure 23 and housing 13 as a result of the spring retainer 143releasably clamping the stationary blade 73 to the tongue 117 and as aresult of the action of the springs 135 and 141 which firmly butreleasably hold the tongue or pivot arm 117 in the operating position.In addition, when the tongue is in the first position, the tongue 117can be easily inserted or withdrawn from the groove 115 on thestationary blade 73.

It is noted that the motor is double insulated from the user as both thebearing sleeves 45 and the housing 13 serve to electrically insulate thearmature structure 31 from the hand of the user holding the hair clipper11. In addition, the drive from the armature structure 31 to the bladeset 71 is electrically insulated as the annular drive member 91operatively engages the plastic yoke member 81. Still further, wear isreduced due to engagement of the metallic drive member 91 with theplastic yoke member 81 and because the annular drive member 91 is freelyrotatable on the eccentric portion 95 of the armature shaft 33.

Various of the features of the invention are set forth in the followingclaims.

I claim:
 1. A hair clipper comprising a housing assembly including arecess, a blade set having a stationary blade with means thereondefining a groove, a blade set mounting assembly including a mountingplate fixed to said housing assembly, a tongue removably extending intosaid groove, means on said tongue and on said mounting plate affordingpivotal movement of said tongue relative to said mounting plate betweena first position permitting insertion and withdrawal of said tonguerelative to said groove and a second position preventing such insertionand withdrawal, and spring means secured to said mounting plate andincluding a portion engaging said tongue for selectively and releasablyholding said tongue in said first and second positions, and a spring insaid recess bearing, at one end, against said housing assembly andbearing, at the other end, against said portion of said spring means toaugment the action of said spring means.
 2. A hair clipper in accordancewith claim 1 wherein said spring is a helical spring which increases theforce releasably and selectively holding said tongue in said first andsecond positions.
 3. A hair clipper comprising a housing assembly, ablade set having a stationary blade with means thereon defining agroove, a blade set mounting assembly including a mounting plate fixedto said housing assembly, a tongue including a shoulder, said tonguebeing carried by said mounting plate for movement between a firstposition extending at a substantial angle to said mounting plate so asto afford assembly and disassembly of said stationary blade on saidtongue by reason of insertion in said groove of said tongue andwithdrawal of said tongue from said groove, and an operating positionextending in generally parallel relation to said mounting plate, and aretainer fabricated of spring material and mounted on said mountingplate and including means releasably gripping said means defining saidgroove to releasably clamp said blade set against said shoulder on saidtongue when said stationary blade is assembled on said tongue and inresponse to movement of said tongue to said operating position.
 4. Ahair clipper in accordance with claim 3 wherein said means on saidstationary blade defining a groove comprises a mounting bracket having araised central portion with a first edge and a pair of spaced edges, andwherein said spring retainer includes a lip releasably engaging saidfirst edge of said raised central portion and further includes a pair ofspaced wings releasably engaging said pair of spaced edges of saidraised central portion.
 5. A hair clipper in accordance with claim 3wherein said means on said stationary blade defining a groove comprisesa mounting bracket having a raised central portion with a first edge,and wherein said spring retainer includes a lip releasably engaging saidfirst edge of said raised central portion.
 6. A hair clipper comprisinga housing assembly including a recess, a blade set having a stationaryblade with means thereon defining a groove, a blade set mountingassembly including a mounting plate fixed to said housing assembly, atongue pivotally carried by said mounting plate for movement relative tosaid mounting plate between a first position permitting insertion andwithdrawal of said tongue relative to said groove and a second positionpreventing such insertion and withdrawal, spring means secured to saidmounting plate and including a portion engaging said tongue forselectively and releasably holding said tongue in said first and secondpositions, a helical spring in said recess bearing, at one end, againstsaid housing assembly and bearing, at the other end, against saidportion of said spring means to augment the action of said spring means,and a spring retainer mounted on said mounting plate and including meansreleasably gripping said means defining said groove to releasably clampsaid blade set on said tongue.
 7. A hair clipper in accordance withclaim 6 wherein said helical spring increases the force releasably andselectively holding said tongue in said first and second positions.
 8. Amovable blade for a hair clipper blade set, said movable bladecomprising a blade member having a forward edge with a series of teethextending therealong, a rearward edge, and an upper surface locatedbetween said forward and rearward edges and having therein a recess withsecond and third edges extending in laterally spaced relation to eachother generally perpendicularly to said forward and rearward edges, ayoke member including a main body of generally U-shape including firstand second walls extending in laterally spaced relation to each otherand a web connecting said first and second walls, said yoke member alsoincluding first and second flange portions respectively extending inlaterally outwardly co-planar relation from said first and second walls,said yoke member extending in said recess with said first and secondwalls extending adjacent to said second and third edges and upwardlytherefrom and with said flange portions in overlying engagement withsaid upper surface of said blade member, a brace member comprising firstand second wall portions extending in laterally spaced parallel relationto each other, a bridge portion connecting said wall portions, first andsecond flange portions respectively extending in laterally outwardlyco-planar relation from said first and second wall portions, andrespective tabs extending downwardly from said flange portions ingenerally perpendicularly relation thereto, said brace member beinglocated with said first and second wall portions in laterally outwardlyoverlying engagement with said first and second walls of said yokemember, with said flange portions of said brace member in overlyingengagement with said flange portions of said yoke member, with saidbridge portion extending forward of said of said walls of said yokemember, and with said tabs in overlying engagement with said rearwardedge of said blade member, and means fixedly securing together inassembled relation said blade member, said yoke member and said bracemember.
 9. A movable blade in accordance with claim 8 wherein said wallsof said yoke member include upwardly and rearwardly extending edgeportions flaring laterally outwardly.
 10. A blade member in accordancewith claim 8 wherein said yoke member is fabricated of plastic materialwhich is electrically insulating and wherein said brace member ismetallic.
 11. A movable blade in accordance with claim 10 wherein saidbrace member is fabricated of spring steel.
 12. A movable blade inaccordance with claim 8 and further including a reinforcing memberincluding an elongated portion having an upper edge and first and secondflange portions extending from said upper edge in laterally spacedrelation to each other, said reinforcing member being located with saidelongated portion in overlying engagement with said tabs of said braceportion and with said flange portions in overlying engagement with saidflange portions of said brace member and with said means fixedlysecuring said blade member, said yoke member, and said brace member alsofixedly securing said reinforcing member in assembled relation to saidblade member, said yoke member, and said brace member.
 13. A hairclipper comprising a housing assembly, a blade set having a stationaryblade with means thereon defining a groove comprising a mounting brackethaving a raised central portion with a pair of spaced edges, a blade setmounting assembly including a mounting plate fixed to said housingassembly, a tongue carried by said mounting plate for movement between afirst position extending at a substantial angle to said mounting plateso as to afford assembly and disassembly of said stationary blade onsaid tongue by reason of insertion in said groove of said tongue andwithdrawal of said tongue from said groove, and an operating positionextending in generally parallel relation to said mounting plate, and aretainer fabricated of resilient materal and mounted on said mountingplate and including means releasably gripping said means defining saidgroove to releasably clamp said blade set on said tongue when saidstationary blade is assembled on said tongue and in response to movementof said tongue to said operating position, said retainer including apair of spaced wings releasably engaging said pair of spaced edges ofsaid raised central portion.
 14. A hair clipper comprising a housingassembly, a blade set having a stationary blade with means thereondefining a groove, a blade set mounting assembly including a mountingplate fixed to said housing assembly, a tongue carried by said mountingplate for movement between a first position extending at a substantialangle to said mounting plate so as to afford assembly and disassembly ofsaid stationary blade on said tongue by reason of insertion in saidgroove of said tongue and withdrawal of said tongue from said groove,and an operating position extending in generally parallel relation tosaid mounting plate, and a retainer fabricated of resilient material andmounted on said mounting plate on the side thereof in adjacent relationto said tongue when the tongue is in said operating position, saidspring retainer including means releasably gripping said means definingsaid groove to releasably clamp said blade set on said tongue when saidstationary blade is assembled on said tongue and in response to movementof said tongue to said operating position.